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R. Mordechai Sasson, in his sefer דבר בעתו in the section called "רמזי מגלה", explains that Haman symbolizes the Yetzer Harah (evil inclination), and his ten sons allude to its ten bad character traits. Their death, brought about by Mordechai and Esther, represents the nullification of such evil traits by being overpowered by the Yetzer Tov (good inclination). He goes through the ten sons, and explains the meaning of each name and how each corresponds to a particular type of evil: